The huge old house is full of closets. Looking in every one of them will take some doing. You decide to start with the closets in the public spaces. You check the closet in the dining room, the kitchen hallway, the lounge, the second floor hallway and the workroom.
You find board games, old shoes, mismatched crutches, huge rolls of butcher paper, cardboard boxes filled with smaller cardboard boxes, stuffed animals, tax forms from the 1970s, a broken hula hoop, and a padlocked chest, but no sign of Sentient Mold.